If physical control, randomization, and design features do not eliminate the differential effects of extraneous variables among treatment groups, the experiment
a. has been confounded, but causal statements are still possible
b. has been confounded, and no causal statements are possible
c. must be repeated without the presence of extraneous variables
d. loses external validity, but can still salvage internal validity
Question 2
As sample size increases, the distribution of sample means of samples of size n (when randomly selected) approaches a normal distribution is a fundamental assumption of the central-limit theorem.
Indicate whether the statement is true or false
The nurse can make observations about the patient's general appearance while talking with the p
drug effects at synapses
Relationship Between Physical Activity and Improved Health Benefits
Equipment and supplies used during a physical examination.
Summary of the Effects of Massage Cont
Biological control pits one organism against another